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Biology, 07.04.2021 06:00 vant

Petra finds a discolored stain on the carpet at a suspected crime scene. What two presumptive tests might she use to determine if the stain is blood? First, Petra sprays the discolored area with , which returns a glowing blue color. However, she knows that this chemical might also turn blue with other substances that contain iron. Subsequently, she uses , which turns pink, indicating the presence of hemoglobin.

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Petra finds a discolored stain on the carpet at a suspected crime scene. What two presumptive tests...
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